Crushing blade arrangement of a crushing drum

ABSTRACT

The invention relates to a crushing blade arrangement of a crushing drum, in which on the outer surface of the crushing drum are arranged a plurality of crushing blades. The arrangement includes, fixedly attached on the outer surface of the drum, a blade holder (1) with a receiving space (3) for an interchangeable blade piece (11). The blade piece (11) is composed of a horizontal blade portion (13) and a vertical shaft portion (12), which shaft portion (12) is adapted to be placed into the receiving space (3) of the blade holder and to be locked into it by means of a separate locking element. The receiving space (3) is shaped as an opening, which has on at least one side a locking protrusion (5) extending inwards to the opening. The shaft portion (12) of the blade piece (11) is shaped as substantially corresponding to the opening of the blade holder and equipped with a locking channel (15) corresponding to said at least one locking protrusion (5) and extending towards the interior space of the shaft, which locking protrusion (5) and locking channel (15) together form a form locking.

The present invention relates to a crushing blade arrangement of a crushing drum according to the preamble of claim 1, in which on the outer surface of the crushing drum are arranged a plurality of crushing blades.

Such crushing drums are used, for example, in bucket crushers to be mounted in an excavator or a bucket loader. FIG. 13 shows a crushing drum 30 according to prior art, described in more detail in U.S. Pat. No. 8,074,914, including blade elements 32 arranged on an axis 31 and having a strip portion 33 and blade pieces 34. The blade elements 32 are welded to the axis 31 along the entire length of their strip portion 33. The disadvantage of such blade elements fixedly attached to the axis of the crushing drum is their serviceability. As the blade parts wear, the entire drum must be replaced with a new or refurbished drum.

The object of the present invention is to provide an improved crushing blade arrangement, which will substantially facilitate refurbishing work. In order to achieve this object, a crushing blade arrangement according to the invention is characterized in that the receiving space is formed as a substantially quadrangular opening opening onto the upper surface of the blade holder and having on at least one side, extending inwards to the opening, a locking protrusion extending between the bottom surface of the blade holder and its upper surface; and that the shaft portion of the blade piece is shaped substantially quadrangular, corresponding to the opening of the blade holder, and equipped with a longitudinal locking channel corresponding to said at least one locking protrusion and extending towards the interior space of the shaft, which locking protrusion and locking channel together form a form locking.

A solution according to the invention enables fast interchangeability of the blade pieces, wherein it is not necessary to exchange the entire drum for servicing. The blade pieces are further to be turned, substantially increasing their total service life.

In the following, the invention is described in more detail with reference to the accompanying figures, in which:

FIGS. 1-3 show an embodiment of a blade holder according to the invention diagrammatically as an oblique isometric view seen from above, as a view seen from the front and as an oblique isometric view seen from below, respectively,

FIGS. 4-6 show a blade holder according to FIGS. 1-3 as seen directly from below, from the side and from above, respectively,

FIGS. 7-9 show an embodiment of a blade piece according to the invention diagrammatically as seen directly from below, from the side and from above, respectively,

FIGS. 10-12 show the blade piece of FIGS. 7-9 as an oblique isometric view seen from above, as a view seen from the front and as an oblique isometric view seen from below, respectively,

FIG. 13 shows a crushing drum according to prior art.

The blade holder 1 shown in FIGS. 1-6 includes a frame portion 2, into which is formed a quadrangular opening 3 for receiving the blade piece into it. Two opposite sides of the opening 3 have, extending inwards to the opening, a locking protrusion 5, which extends between the bottom surface 7 of the blade holder and its upper surface, preferably the entire distance from the bottom surface to the upper surface. Into the blade holder is further formed a through hole 4, which travels at the locking protrusions 5. To the other two sides of the opening 3, which have no locking protrusion and are opposite each other, is formed to their upper edge an indentation 6 opening onto the outer surface of the blade holder, into which indentation is to be fitted a tool for detaching the blade piece in the holder.

The shaft portion 12 of the blade piece 11 shown in FIGS. 7-12 is shaped substantially as corresponding to the opening 3 of the blade holder and equipped on its main surfaces with longitudinal locking channels 15 of the shaft corresponding to said locking protrusions 5 and extending towards the interior space of the shaft, which open onto the lower surface of the shaft, allowing the shaft to be inserted into the opening 3 of the blade holder. The locking protrusion 5 and the locking channel 15 coming opposite to each other together form a form locking. Into the blade piece 11 is also formed a horizontal locking hole 16, which travels substantially at the locking channels 15. The blade pieces are placed into the quadrangular opening 3 by a movement in the direction of the shaft of the blade pieces, i.e. substantially in the direction of the radius of the crushing drum. When the blade piece is in place, the locking holes 4 and 16 in the blade holder settle into alignment and the blade piece can be locked into place by means of a locking element (not shown) extending through the holes. The side surfaces of the shaft portion 12 are preferably shaped as downwardly converging from their upper portion 17 a, which facilitates the detaching of a blade piece from the blade holder. The lower portion 17 b of the side surfaces is substantially straight. Reference numeral 13 of FIGS. 10-12 shows the horizontal portion of the blade piece and reference numeral 14 the front surface forming the work surface. 

1. A crushing blade arrangement of a crushing drum, in which on the outer surface of the crushing drum are arranged a plurality of crushing blades, which arrangement includes, fixedly attached on the outer surface of the drum, a blade holder with a receiving space for an interchangeable blade piece; that the blade piece is composed of a horizontal blade portion and a vertical shaft portion, which shaft portion is adapted to be placed into the receiving space of the blade holder and to be locked into it by means of a separate locking element; wherein the receiving space is shaped as a substantially quadrangular opening opening onto the upper surface of the blade holder and having on at least one side, extending inwards to the opening, a locking protrusion extending between the bottom surface of the blade holder and its upper surface; and that the shaft portion of the blade piece is shaped substantially quadrangular, corresponding to the opening of the blade holder, and equipped with a longitudinal locking channel of the shaft portion corresponding to said at least one locking protrusion and extending towards the interior space of the shaft, which locking protrusion and locking channel together form a form locking.
 2. The arrangement according to claim 1, wherein on two opposite sides of the opening are locking protrusions extending towards each other, and that the shaft of the blade piece has on its two opposite sides locking channels corresponding to the locking protrusions.
 3. The arrangement according to claim 2, wherein into the blade holder is formed a horizontal locking hole, which travels substantially at the locking protrusions, and that into the blade piece is formed a corresponding horizontal locking hole, which travels substantially at the locking channels.
 4. The arrangement according to claim 2, wherein to the upper edge of the two opposite sides of the opening of the blade holder is formed an indentation extending on the outer surface of the blade holder, into which indentation is to be fitted a tool for detaching the blade piece in the holder, which indentations are located on those sides of the opening, which have no locking protrusions.
 5. The arrangement according to claim 1, wherein the bottom surface of the holder is formed as curved, corresponding to the curvature of the outer surface of the crushing drum. 